Fixed-Share to Equity Partner: How Your Tax Changes on Promotion

What Actually Changes When You Make Equity Partner

Being promoted from fixed-share (or salaried) partner to full equity partner is, for tax, a change of status, not just a pay rise. That single idea organises everything that follows. As a fixed-share partner you may well have been taxed as an employee: PAYE deducted from your reward, employee National Insurance taken at source, and employer National Insurance paid by the firm on top. As a genuine equity partner you become self-employed for tax, taxed on a share of the firm's profit through self-assessment, paying Class 4 National Insurance instead of Class 1, with no employer National Insurance for the firm to bear.

Three things change at the moment of promotion, and they are the spine of this guide. First, your tax status switches from employee to self-employed. Second, you almost always have to contribute capital to the firm, money you have to find. Third, you start filing self-assessment and meet payments on account, which collect tax later and in lumps rather than smoothly through payroll. Each of those is new ground for most newly promoted partners, and each carries a cash-flow consequence worth setting up before the promotion date rather than after the first bill arrives.

This page assumes the firm is a partnership or limited liability partnership (LLP), which are tax-transparent: the firm pays no corporation tax on its trading profit, and each partner is taxed personally on their allocated share (ITTOIA 2005 section 863). If your firm is an incorporated practice (a company or alternative business structure), promotion to a director or shareholder role is a different question involving salary, dividends and shares, and is out of scope here.

The Starting Point: How a Fixed-Share or Salaried Partner Is Usually Taxed

Many fixed-share and salaried members are, in substance, employees for tax. That is the effect of the salaried member rules introduced by Finance Act 2014, which inserted ITTOIA 2005 sections 863A to 863G. Where the rules apply, the member is treated as employed by the LLP under a contract of service, so PAYE and National Insurance apply to their reward exactly as for any employee.

The rules catch a member only if all three of the following conditions are met. Fail any one and the member stays self-employed for tax.

• Condition A, disguised salary (section 863B): at least 80% of the member's total reward is fixed, or varies without reference to the LLP's overall profits or losses.
• Condition B, significant influence (section 863C): the member does not have significant influence over the affairs of the LLP.
• Condition C, capital contribution (section 863D): the member's capital contribution is less than 25% of their disguised salary.

For a member who is caught, the firm operates PAYE on the reward, the member pays employee Class 1 National Insurance (8% then 2% in 2025/26), and the firm pays employer (secondary Class 1) National Insurance at 15% on reward above the £5,000 secondary threshold (from 6 April 2025). We do not re-teach the three conditions in full here. For the detailed framework, see our explainer on the salaried member rules for UK LLPs.

From the individual's point of view, life under the rules looks a lot like employment. Tax and National Insurance come off before the money reaches their bank account, there is a payslip, and the firm bears an extra cost in employer National Insurance that does not appear on the partner's own figures but does affect the overall economics of their seat. It is also worth being clear that being treated as an employee for tax under the salaried member rules is a tax characterisation only. It does not necessarily make the person an employee for employment-law purposes, and it does not change their status as a member of the LLP under company and partnership law. The point that matters for this guide is the tax treatment, because that is what flips on promotion.

The Salaried-Member Exit: Why Promotion to Full Equity Usually Breaks the Rules

This is the section that distinguishes a promotion from a static comparison. A genuine full equity partner typically fails the salaried member conditions on more than one limb, so once the new arrangement takes effect the member is no longer treated as an employee for tax. In practice, three things change together:

• Reward genuinely varies with profit. An equity partner's income now moves up and down with the firm's overall result, so less than 80% of it is disguised salary and Condition A fails.
• You gain real influence. Equity partners typically have a genuine say in how the firm is run, voting on the things that matter, so Condition B fails.
• You contribute capital at risk. Becoming equity usually means committing capital of at least 25% of your reward, genuinely exposed to the firm's losses, so Condition C fails.

The crucial point is that this has to be real. The title equity partner does not by itself end employee treatment. HMRC looks at the substance of the arrangement, not the label, and the rules are tested year by year. If the new deal genuinely gives you variable reward, influence and capital at risk, you are self-employed from the date it takes effect. If your equity is mostly a fixed amount dressed up with a grand title, you can still be caught. So the underlying economics, not the new business card, decide your status.

From PAYE to Self-Assessment: The NIC and Collection Change

Once you are out of the salaried member rules, the mechanics of how you are taxed change. As a self-employed partner you pay income tax and Class 4 National Insurance on your allocated profit share through self-assessment, not PAYE. Class 4 National Insurance for 2025/26 is 6% on profits between £12,570 and £50,270 and 2% above. Employee Class 1 National Insurance stops, and so does the employer National Insurance the firm used to pay on you.

Class 2 National Insurance is no longer a charge from 6 April 2024. If your profits are at or above the small profits threshold you are treated as having paid Class 2, so your state-pension entitlement is preserved without a payment. There is nothing extra to do on that front.

The change that catches people out is not the rate, it is the timing. Under PAYE, tax came off as you earned, every month, automatically. Under self-assessment, tax on your profit share is collected later and in lumps: a balancing payment after the tax year ends, plus payments on account towards the next year. That shift from monthly-at-source to twice-a-year-in-arrears is the heart of the cash-flow shock covered below.

There is also a reporting change that comes with the status switch. As a self-employed partner you are responsible for your own self-assessment return each year, on which you report your allocated share from the firm's partnership return. The firm prepares a partnership return (the SA800) showing the firm's profit and how it is allocated between the partners, and each partner picks up their own share on the partnership pages of their personal return (the SA100). Where you were previously an employee with tax dealt with entirely through payroll, you now have a filing obligation and a payment timetable of your own. None of this is difficult, but it is yours to run, and missing a deadline carries its own penalties separate from the tax itself.

The Capital Buy-In Trigger: You Now Have to Put Money In

Becoming full equity almost always means contributing capital to the firm. As noted above, it is also one of the levers that breaks the salaried member rules. The capital is your investment in the firm: it is recorded on your capital account, it is not taxable income to you when you put it in, and it is not a tax-deductible expense. You cannot deduct your buy-in from your tax bill. For the full mechanics of the capital account, how it differs from the current account, and the treatment of interest on capital, see our guide to law firm partner capital accounts and their tax treatment.

What is genuinely new is that you have to find the money. The common routes are personal savings, a dedicated partnership capital loan (often arranged through the firm's bank), or a firm-financed arrangement where the capital is built up out of retained profit over time. The amount required varies widely by firm and by tier, and we deliberately do not restate firm-tier figures here. For the cost of buying in and the financing market, see how much it costs to buy into a UK law firm partnership. This page stays on the tax-status change rather than the pound amount.

Funding the Capital: Qualifying-Loan Interest Relief (the Live Deduction)

If you borrow to fund the capital contribution, the interest on that loan is deductible against your income under the qualifying-loan interest relief rules in ITA 2007 sections 398 to 412. This is a real and often overlooked deduction for newly promoted partners. The conditions are specific:

• Qualifying use (section 398): the loan must be used to purchase a share in the partnership, to contribute capital to a partnership used wholly for the purposes of its trade or profession, to advance money to such a partnership, or to repay another qualifying loan of this kind.
• Member throughout (section 399): you must be a member of the partnership throughout the period from when the loan is used until the interest is paid. If you cease to be a member, relief is unavailable for interest after that point.
• Not an investment LLP (section 399): relief is denied where the LLP is an investment LLP (its business consists wholly or mainly of making investments, with the principal part of its income from investments). A trading law firm is not an investment LLP.
• Capital recovery (section 399 and sections 406 to 412): relief is withdrawn to the extent you later recover capital from the partnership, broadly as if you had repaid part of the loan.

Relief is given at your marginal rate and claimed on your self-assessment return. There is a general cap on certain income tax reliefs (ITA 2007 section 24A) set at the greater of £50,000 or 25% of adjusted total income, which can in principle limit very large claims, but typical partner buy-in interest sits comfortably within it. Keep the loan-use documentation clean (the loan should clearly be applied to the capital contribution) so the relief is unarguable.

The First-Year Self-Assessment and Payments-on-Account Shock

This is the cash-flow event most new equity partners are unprepared for. In your first year as a self-employed partner, tax on the profit share is not collected as you earn it. It lands as a self-assessment bill on the 31 January after the tax year. So far, so manageable. The sting is that on that same 31 January you may also have to make the first payment on account towards the next year.

Payments on account are advance instalments set by TMA 1970 section 59A: two payments on account of your income tax liability, the first on or before 31 January and the second on or before the following 31 July, each equal to 50% of the prior year's liability. They are required unless your last self-assessment bill was under £1,000, or more than 80% of your tax was collected at source. Class 4 National Insurance is included in the calculation.

The practical result is a pile-up. The first 31 January after a full year as a partner can carry the balancing payment for that year plus a first 50% payment on account for the next year, so the cash demand can look like roughly 150% of a single year's tax in one go, with a further 50% due the following 31 July. It is essential to understand that this is timing, not extra tax. The system is catching up to your real-time income in arrears. For the reserving discipline that absorbs it, and the precise payment-on-account mechanics, see our guide to tax reserving and payments on account for law firm partners.

A Worked Sketch: The Status Switch in Numbers

The following is illustrative only, anonymised, and not advice. Take a fixed-share partner caught by the salaried member rules. The firm deducts income tax and employee Class 1 National Insurance from their reward through payroll, and pays employer National Insurance at 15% on the reward above the £5,000 secondary threshold (2025/26). On promotion to full equity, the same person is allocated a profit share and is taxed on it through self-assessment, paying Class 4 National Insurance at 6% then 2% instead of Class 1, with no employer National Insurance for the firm to bear.

The take-home difference between the two states is often modest. The far bigger change is twofold: collection moves from monthly-at-source to twice-a-year-in-arrears, and the firm sheds the employer National Insurance cost. Add the second worked point: if that new partner borrows to fund the capital buy-in and pays loan interest in the year, relief at a 40% marginal rate gives back 40% of the interest, claimed under ITA 2007 section 398, which reduces the net cost of financing the buy-in. And the third: that first 31 January can demand the balancing payment plus a 50% payment on account, approaching 150% of a year's tax, a timing pile-up rather than a new liability.

What to Set Up Before the Promotion Date

Getting organised before the promotion takes effect is far easier than reacting to the first bill. A practical checklist:

• Register for self-assessment in good time. If you have not filed before, notify HMRC by 5 October following the tax year in which you become self-employed as a partner.
• Arrange the capital and the loan, and document the use of funds, so the section 398 interest relief is clean and the loan is clearly applied to the contribution.
• Start a tax reserve immediately rather than waiting for the first bill. Sweep a percentage of each profit allocation into a separate account from day one.
• Confirm the transition with the firm. Check whether your old PAYE reward is being trued up, and whether there is any overlap between the employed period and the new self-employed period.
• Check the firm's accounting date. If it is not 31 March or 5 April, the move to the tax-year basis can affect your first-year figures (see basis period reform for law firms and the reserving guide).

A Note on What Does Not Change

It is worth keeping the change in proportion. The firm is still tax-transparent, so you were always going to be taxed on the firm's results in some form, whether as employee reward or as a profit share. Your underlying income tax bands and rates are the same (personal allowance £12,570 tapered between £100,000 and £125,140, basic rate 20%, higher 40%, additional 45%, all 2025/26). And the salaried member analysis is the same framework you may already have been sitting just inside of as a fixed-share partner.

What changes is collection and status, not the fundamental fact that your income is taxed. With a reserve in place from the start, the move is entirely manageable. The newly promoted partners who struggle are almost always the ones who treated the first big 31 January as a surprise rather than something they had been setting money aside for since the promotion date. For the underlying steady-state member tax, see how LLP members are taxed, and for why you are taxed on the share rather than what you draw, see law firm drawings versus profit. For how the new share itself is set, see partner profit allocation in UK law firms.

How This Differs From the Pay-Structure Comparison

If you are weighing up whether a salary or a profit share is more tax-efficient as a static question, that is a different page: see salary versus profit share tax for a partner solicitor, which compares the two structures at a point in time. This page is about the transition event itself: what happens to your status, your capital and your cash flow at the moment of promotion. The two work together, one telling you which structure is more efficient, the other telling you what to do when you move between them.

Getting It Right: Speak to a Specialist

The promotion letter, the capital and loan paperwork, the salaried-member analysis, and the first self-assessment all want to be set up together rather than dealt with piecemeal after the event. A small change in how the new equity deal is structured can decide whether you are genuinely outside the salaried member rules from day one, and clean loan documentation decides whether your interest relief is unarguable.

Every promotion is different, and the figures and timing depend on your firm's accounting date, your profit share and your funding. If you are being promoted to equity partner and want the status change, the capital funding and the first tax year planned as one piece, speak to a legal-sector-specialist accountant who can map it to your firm's arrangement and your own position.